My guess would be Grenada. The dominant station for me at both times was CBC and it is not them. I get the same music as you interfering with CBC at 0524 - and the offset matches with what Grenada has been on recently.

My guess would be Grenada. The dominant station for me at both times was CBC and it is not them. I get the same music as you interfering with CBC at 0524 - and the offset matches with what Grenada has been on recently.